*{
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    box-sizing: border-box;
    text-decoration: none;
    list-style: none;
}

:root{
    --color-primary: #6c63ff;
    --color-success: #00bf8e;
    --color-warning: #f7c94b;
    --color-danger : #f75842;
    --color-danger-variant: rgba(247,88,66,.4);
    --color-white: #fff;
    --color-light: rgba(255,255,255,0.7);
    --color-black: #000;
    --color-bg: #1f2641;
    --color-bg1: #2e3267;
    --color-bg2: #424898;

    --container-width-lg: 80%;
    --container-width-md: 90%;
    --container-width-sm: 94%;

    --transition: all 400ms ease;


}

body{
    font-family: 'Montserrat', sans-serif;
    line-height: 1.7;
    color: var(--color-white);
    background: var(--color-bg);
}

.container{
    width: var(--container-width-lg);
    margin: 0 auto;
    
}

section{
    padding: 6rem 0;
}
section h2{
    text-align: center;
    margin-bottom: 4rem;
    
}

h1,
h2,
h3, 
h4, 
h5{
    line-height:1.2 ;
}

h1{
    font-size: 2.4;
}
h2{
    font-size: 2rem;
}
h3{
    font-size: 1.6rem;
}
h4{
    font-size: 1.3rem;
}

a{
    color: var(--color-white);
}

img{
    width: 100%;
    display: block;
    object-fit: cover;
}

.btn{
    display: inline-block;
    background: var(--color-white);
    color: var(--color-black);
    padding: 1rem 2rem;
    border: 1px solid transparent;
    font-weight: 500;
}

.btn:hover{
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn-primary{
    background: var(--color-danger);
    color: var(--color-white);
}
/* nav section started */
nav{
    width: 100vw;
    height: 5rem;
    position: fixed;
    top: 0;
    z-index:11;
}

/* change navbar styles on scroll using javascript */
.window-scroll{
    background: var(--color-primary);
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, .2);

}
.nav_container{
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav #open-menu-btn{
    display: none;
}
.nav_menu{
    display: flex;
    align-items: center;
    gap: 4rem;
}

.nav_menu a{
    font-size: .9rem;
    transition: var(--transition);
    -webkit-transition: var(--transition);
    -moz-transition: var(--transition);
    -ms-transition: var(--transition);
    -o-transition: var(--transition);
}

.nav_menu a:hover{
    color: var(--color-bg2);
}

/* nav section ends */

/* header section starts */
header{
    position: relative;
    top: 5rem;
    overflow: hidden;
    height: 70vh;
    margin-bottom: 5rem;
}

.header_container{
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 5rem;
    height: 100%;
}

.header_left p{
    margin: 1rem 0 2.4rem;
}

.header-right img{
    align-self: center;
}
/* header section ends */

/* categories section starts*/
.categories{
    background: var(--color-bg1);
    height: 32rem;
}
.categories h1{
    line-height: 1;
    margin-bottom: 3rem;
}

.categories_container{
    display: grid;
    grid-template-columns: 40% 60%;
    gap: 4rem;

}

/* .categories_left{
    margin-left:4rem ;
} */
.categories_left p{
    margin:1rem 0 3rem ;
}

.categories_right{
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 1.2rem;
}

.category{
    background: var(--color-bg2);
    padding: 2rem;
    border-radius: 2rem;
    transition: var(--transition);
    -webkit-transition: var(--transition);
    -moz-transition: var(--transition);
    -ms-transition: var(--transition);
    -o-transition: var(--transition);
    -webkit-border-radius: 2rem;
    -moz-border-radius: 2rem;
    -ms-border-radius: 2rem;
    -o-border-radius: 2rem;
}

.category:hover{
    box-shadow: 0 3rem 3rem rgba(0,0,0,.3);
    z-index: 1;
}

.category:nth-child(2) .category_icon{
    background: var(--color-danger);
}

.category:nth-child(3) .category_icon{
    background: var(--color-success);
}

.category:nth-child(4) .category_icon{
    background: var(--color-warning);
}

.category:nth-child(5) .category_icon{
    background: var(--color-success);
}

.category_icon{
    background-color: var(--color-primary);
    padding: .7rem;
    border-radius: .9rem;
    

}

.category h5{
    margin: 2rem 0 1rem;
}

.category p{
    font-size: .85rem;
}
/* categories section ends*/

/* courses section starts*/
.courses{
    margin-top: 10rem;
}

.courses_container{
    display: grid;
    grid-template-columns: repeat(3,1fr);
    /* gap: 2rem;
    display: flex;
    flex-wrap: wrap; */
    gap: 1.5rem 1rem;
    /* justify-content: center;
    align-items: center; */
    
}

.course{
    flex: 1 1 20rem;

    background: var(--color-bg1);
    text-align: center;
    border: 1px solid transparent;
    transition: var(--transition);
   
}

.course:hover{
    background: transparent;
    border-color:var(--color-primary);
}

.course_info{
    padding: 2rem;
}

.course_info p{
    margin: 1.2rem 0 2rem;
    font-size: .9rem;
}

/* courses section ends*/

/* faqs section starts*/
.faqs{
    background: var(--color-bg1);
    box-shadow: inset 0 0 3rem rgba(0, 0, 0, .5);
}

.faqs_container{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.faq{
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.4rem;
    height: fit-content;
    background: var(--color-primary);

}

.faq h4{
    font-size: 1rem;
    line-height: 2.2;
}

.faq_icon{
    align-self: flex-start;
    font-size: 1.2rem;
}

.faq p{
    margin:  .8rem;
    display: none;
}

.faq.open p{
    display: block;
}


/* faqs section ends*/

/* testimonials section starts */

.testimonials_container{
    overflow-y: hidden;
    position: relative;
    margin-bottom: 5rem;

}

.testimonial{
    padding-top: 2rem;
}

.avatar{
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    overflow: hidden;
    margin:  0 auto 1rem;
    border: 1rem solid var(--color-bg1);
}



.testimonials_info{
    text-align: center;
}
.testimonials_body{
    background: var(--color-primary);
    padding: 2rem;
    margin-top: 3rem;
    position: relative;
}

.testimonials_body::before{
    content: "";
    display: block;
    background: linear-gradient(135deg, transparent , var(--color-primary), var(--color-primary), var(--color-primary));
    width: 3rem;
    height: 3rem;
    position: absolute;
    left: 48%;
    top: -1.5rem;
    transform: rotate(45deg);

}
.mySwiper{
    overflow: hidden;
}
/* testimonials section ends */

/* footer section starts */
footer{
    background: var(--color-bg1);
    padding-top: 5rem;
    font-size: .9rem;
}
.footer_container{
    display: grid;
    grid-template-columns: repeat(4 ,1fr);
    gap: 5rem;
}

.footer_container div h4{
    margin-bottom:1.2rem ;
}

.footer_1 p{
    margin: 0rem 0 2rem;
}
footer ul li{
    margin-bottom: .7rem;
}
footer ul li a:hover{
    text-decoration: underline;
}

.footer_socials{
    display: flex;
    gap: 1rem;
    font-size: 1.2rem;
    margin-top: 2rem;
}

.footer_copyright{
    text-align: center;
    margin-top: 4rem;
    padding: 1.2rem 0;
    border-top:  1px solid var(--color-bg2);
}

/* footer section ends */

/* media queries */
/* tablet media query */
@media screen and (max-width:1024px) {
    .container{
        width: var(--container-width-md);
    }
    h1{
        font: 2.2rem;
    }
    h2{
        font-size: 1.7rem;
    }
    h3{
        font-size: 1.4rem;
    }
    h4{
        font-size: 1.2rem;
    }
    /* navbar in tablet */
    nav #open-menu-btn{
        display: block;
        background: transparent;
        font-size: 1.8rem;
        color: var(--color-white);
        cursor: pointer;
        /* font-size: 2.5rem;
        padding: .5rem 1.5rem;
        border: .1rem solid var(--color-danger);
        color: var(--color-danger);
        border-radius: .3rem;
        cursor: pointer;
        display: block; */

    }

    nav button#close-menu-btn{
        display: none;
    }
    .nav_menu{
        position: fixed;
        top: 5rem;
        right: 5%;
        height: fit-content;
        width: 18rem;
        flex-direction: column;
        gap: 0;
        display: none;
    }
    .nav_menu.active{
        display: flex;
    }

    .nav_menu li{
        width: 100%;
        height: 5.8rem;
        animation: animateNavItems 400ms linear forwards;
        transform-origin: top right;
        opacity: 0;
    }

    .nav_menu li:nth-child(1){
        animation-delay: 0ms;
    }

    .nav_menu li:nth-child(2){
        animation-delay: 200ms;
    }

    .nav_menu li:nth-child(3){
        animation-delay: 400ms;

    }
    .nav_menu li:nth-child(4){
        animation-delay: 600ms;

    }
    


    @keyframes animateNavItems {
        0%{
            transform: rotateZ(-90deg) rotateX(90deg) scale(1);
        }
        100%{
            transform: rotateZ(0);
            opacity: 1;
        }
        
    }

    .nav_menu li a{
        background: var(--color-primary);
        box-shadow: -4rem 6rem 10rem rgba(0, 0, 0, .6);
        width: 100%;
        height: 100%;
        display: grid;
        place-items: center;
        /*justify-content: center;
        align-items: center; */
    }
    .nav_menu li a:hover{
        background: var(--color-bg2);
        color: var(--color-white);
    }

    /* header section */
    header{
        height: 70vh;
        margin-bottom: 6rem;
    }
    .header_container{
        gap: 0rem;
        /* padding-bottom: 3rem; */
    }
    .categories{
        height: auto;
    }
    .categories_container{
        grid-template-columns: 1fr;
    }
    .categories_left{
        margin-left: 0;
    }

    /* popular courses */
    .courses{
        margin-top: 0;
    }

    .courses_container{
        grid-template-columns: 1fr 1fr;
    }
    
    /* popular faqs */
    .faqs_container{
        grid-template-columns: 1fr;
    }

    .faq{
        padding: 1.5rem;
    }

    /* footer section */
    .footer_container{
        grid-template-columns: 1fr 1fr;
    }

}

/* media queries for phone */
@media screen and (max-width:600px) {
    .container{
        width: var(--container-width-sm);
    }

    /* navbar */
    .nav_menu{
        right: 3%;
    }

    nav #open-menu-btn{
        padding-right: 3%;
    }

    /* header */
    
    header{
        height: auto;
        padding-bottom: 1rem;
    }

    .header_container{
        grid-template-columns: 1fr;
        text-align: center;
        margin-top: 0;
    }
    .header_left{
        padding-bottom: .9rem;
    }
    .header_left p{
        margin-bottom: 1.3rem;
    }

    /* categories */
    /* .categories{
        margin-top: 7rem;
    } */
    
    .categories_right{
        grid-template-columns:1fr 1fr ;
        gap: .7rem;
    }

    .category{
        padding: 1rem;
        border-radius: 1rem;
    }

    .category_icon{
        margin-top: 4px;
        /* display: inline-block; */
    }

    /* courses section */
    .courses_container{
        grid-template-columns: 1fr;
    }

    /* testimonials section */
    .testimonials_body{
        padding: 1.2rem;
    }

    /* footer section */

    .footer_container{
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1.5rem;
    }

    .footer_1 p{
        margin: 1rem auto;
    }

    .footer_socials{
        justify-content: center;
    }




}

/* for galaxy media query */
@media screen and (max-width:300px) {
    .header_container{
        height: auto;
    }

    .categories_right{
        grid-template-columns:1fr ;
        gap: .7rem;
    }

    
}